<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<a href="/index?lang=zh_CN">中文</a>
<a href="/index?lang=en_US">English</a>

<h1 th:text="#{welcome}"></h1>

</body>
</html>